Among the miles and miles of devastated houses, rubble still there today in New Orleans, we found dry, beautiful homes. But their residents were told by guys dressed like Ninjas wearing “Blackwater” badges: “Try to go into your home and we’ll arrest you.”

while the individuals working for blackwater are in fact mercenaries and the organization is indeed a private military company, this does not exclude it from the status of a milita.
as defined by oxford:
“Militia – a group of people who are not professional soldiers but who have had military training and can act as an army”